Dynamo-electric machine.



' No. 627,53l. Patontod Juno 27, I899.

- w. H. A RUTTH.

DYNAIIO ELECTRIC MACHINE.

(Application filed Mar. 11, 1899.)

(NoModoL) UNITED STATES PATENT OFFICE.

\VILIIELM IIUGO AUGUST ROTTH, OF BERLIN, GERMANY, ASSIGNOR TO THE SIEMENS & IIALSKE ELECTRIC COMPANY OF AMERICA, OF CHICAGO,

ILLINOIS.

SPECIFICATION forming part of Letters Patent No. 627,531, dated June 27, 1899.

Application filed March 11,1899. $erial No. 708,750. (No model.)

To all whom it may concern:

Be it known that I, WILHELM HUGO AU- GUST ROTTH, a subject of the Emperor of Germany, residing at Berlin, Germany, have invented a certain new and useful Improvement in Dynamo-Electric Machines, (Case No. 184,) of which the followingis a full, clear, concise, and exact description.

My invention relates to improvements in dynamo-electric machines, and has for its object the provision of means for securing thorough ventilation throughoutits several parts, whereby the temperature of the machine is materially reduced during the operation thereof.

My said invention is more particularly applicable to dynamo-electric machinery for producing multiphase alternating currents, in connection with one of which I will describe the same more at length.

In the operation of various classes of dynamo-electric machines it has been found that heated air is drawn back into the machine in large quantities during its operation instead of being displaced by the cooler air of the dynamo-room. It will be at onceunderstood that this continued circulation-of practically the same volume of air does not secure a very high degree of efficiency in cooling the heated portions of the machine, and as a result the temperature is permitted unduly to increase. By constructing a dynamoelectric machine in accordance with my invention the above difficulty is overcome, with the attendant advantage of constantly supplying the ventilated portions of the machine with fresh quantities of air, while the radiating-surfaces of a given machine are materially increased by utilizing the relatively large surfaces of the frame for the purposes of radiation.

I may briefly designate the improvements of my invention as consisting in providing a casing in association with the ventilating-passages of a dynamo-electric machine, which passages and easing are adapted to direct the flow of air within the machine around the heated parts against the hollowed frame and out to the external air at points distant from the air-inlets of the said machine.

armature-core.

. My invention will be more readily understood by reference to the accompanying drawings, wherein Figure 1 is a sectional view in the line of axis of a dynamo-electric machine to which my improvements are applied. Fig. 2 is a View, partially in section, on line 2 2 of Fig. 1; and Fig. 3 is a detail View showing a modification of the form of machine illustrated in the two preceding figures.

The same letter of reference is used to designate like parts in each of the several figures of the drawings.

WVithin the dynamo-frame a the stator portion havinga field-core 19, formed of laminated iron and provided with grooves to receive the windings, is supported by means of the inwardly-extending ribs 0. By thus mounting the fields at a distance from the frame of the dynamo a ventilating-chamber is provided therebetween which has relatively large metal surfaces exposed to the flow of air, the said chamber being in communication with the external air by means of openings (1, disposed about the circumference of the frame. The rotor portion or armature d is provided with lateral air passages e, which communicate with the annular air-channel f, bisecting the Within the said channel are provided spacing-blocks f, disposed between the intersecting air-passages e, thus maintaining the connection between the said passages and the periphery of the armature. The said armature is mounted upon a shaft d, rotating in the bearings d which are formed integrally with the dynamo-frame.

Upon the left-hand-side ofthe armature,

(see Fig. 1,) which is provided with ,loar-conductors and connecting-stirrups, are secured the blades or fans g, while the winding-loops g and their protecting-ring g are placed upon the right-hand side, the same serving the common purpose with the fans of forcing the air from either side through the lateral passages c-wl1en the machine is in operation;

Before the openings at the sides of the dynamo-frame are disposed annular shields or casings h, which are secured to the frame and which extend inwardly to inclose the blades and winding-loops, while their central I00 openings register with the exterior walls of the lateral air-passages in the armature.

It is apparent that when the machine is in motion the-blades g andwinding-loops g in connection with the antrular shields h admirably serve the purpose of ventilatin g-fans and secure the circulation of large quantities of air within the dynamo; The air drawn in upon either side of the armature takes divided paths, one portion being circulated by means of the fans through the windings and 'connecting-stirrups of the rotor and statorportions, while another portion passes through the lateral passages e in the laminated core to the annular channel fa Thence it divides, flowing in either direction between the armature and fields to meet the vertical air-currents supplied by the fans, whence the air is directed around the fields into the ventilatingchamber beneath the frame and out at the openings at.

The flow of the several air-currents is indicated in the drawings by means of arrows, which illustrate the ample ventilation of the several parts of the machine. '1

It will be seen that the intakezand exhaust openings are widely separated and that the annular shields h prevent the return flow of the heated air. In addition the extensive surfaces of the frame are exposed to the flow of air and materially assist in securing the radiation of heat from the several parts of the dynamo. If desired, the fan-blades may be dispensed with, as shown in Fig. 3, wherein the casing h is carried inwardly, so that it conforms very closely to the adjacent armature. The natural tendency of the air to flow in the directions indicated is thus relied upon to secure the supply of air necessary for I made in the dynamo herein shown and described without departing from the spirit of my invention, and I do not desire to be understood as limiting the same to the precise form of apparatus above set forth; but,

Having now described a dynamo-electric machine constructed in accordance with my invention, what I claim as new, and desire to secure by these Letters Patent, is-

1. The combination with a dynamo-electric machine, of annular casings or shields h fitted within the frame and conforming approximately to the exterior of the field-magnets and armature, openings therein registering with lateral ventilating-openings in the said armature, whereby the heated air directed through the said ventilating-openings is prevented from returning and circulating within the machine, substantially as described.

2. The combination with a dynamo-electric machine, of shields or casings disposed at the sides thereof and conforming approximately to the adjacent field-magnets and armature between which ventilating-passages are provided, the said casings having openings provided near the axis of the armature communicating with ventilating-passages provided therein, whereby cool air is supplied to said ventilating-passages and circulated throughout the machine, substantially as described.

3. The combination with a dynamo-electric machine, of shields or casings disposed at the sides thereof and conforming approximately to the adjacent field-magnets and armature between whichsventilating-passages are provided, the said :casings having openings provided near the axis of the armature communicating with ventilating-passages provided therein, and fans or ventilating parts associated with the'said armature adapted to assist in circulating the air through the ventilating-passages provided in the machine, the air being drawn through the openings in the casing and circulated throughout the machine, substantially as and for the purpose described.

s 4. In a dynamo-electric machine, the combination with a hollow frame a,- of a stator portion I) mounted therein by means of the supporting-ribs c, shields or casings 7L disposed at the sides of the machine conforming generally to the stator and rotor portions thereof, the same being provided with openings near the axis of the rotor portion, and means for securing the circulation of air through the said openings and the ventilatingpassages of the dynamo-electric machine, sub stantially as described.

5. The combination in a dynamo-electric machine with an armature provided with lateral air-passages e disposed near its axis, and intersecting air-ducts communicating there with and with the periphery of the armature, of shields or casings 71 disposed at the sides of the machine conforming approximately to the field-magnets and armature thereof, said casings being provided with openings registering with the lateral openings in the arma ture, and fans or ventilators disposed within said casings adapted to assist in securing the circulation of air within the machine, substantially as described.

6. The combination in a dynamo-electric machine of the class described withfield-magnets I) mounted within a hollow frame a, of an armature provided with lateral and verti cal ventilating-openings e f, casings or shields h disposed at the sides of the machine conforming approximately to the exteriors of the field-magnets and armature, the same comprising with the frame of the dynamo means for directing the air-currents about the exteriors of the field-magnets and armature, said casings'being provided with openings near the axis of the armature adapted to serve as intakes for the air, and fan-blades provided at the sides of the armature adapted to assist the circulation of air throughout the ventilating-passages in the dynamo, substantially as described.

7. The combination in a dynamo-electric machine with a hollow frame provided with return of heated air within the machine is obcircumferential openings for the discharge of viated, substantially as described. I 10 air, of shields 0r casings disposed at the sides In witness whereof I hereunto subscribe my 0f the machine and inclosing the field-magname this 11th day of February, A. D. 1899.

5 nets and armature, said casings havinginlet- WILIIELM HUGO AUGUST ROTTH.

openings provided therein near the axis of \Vitnesses: the armature communicating with the ven ti- PAUL ROEDIGER,

lating-passagcs of the machine, whereby the HENRY HASPER. 

